Test that abstract models are indeed abstract

Author: mfonism

.gitignore

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+
+# Created by https://www.gitignore.io/api/django
+# Edit at https://www.gitignore.io/?templates=django
+
+### Django ###
+*.log
+*.pot
+*.pyc
+__pycache__/
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+db.sqlite3
+media
+
+# If your build process includes running collectstatic, then you probably don't need or want to include staticfiles/
+# in your Git repository. Update and uncomment the following line accordingly.
+# <django-project-name>/staticfiles/
+
+### Django.Python Stack ###
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+MANIFEST
+
+# PyInstaller
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+# Installer logs
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+# Unit test / coverage reports
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+
+# pyenv
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+# End of https://www.gitignore.io/api/django

aso_models/__init__.py

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+from django.apps import AppConfig
+
+
+class AsoModelsConfig(AppConfig):
+    name = 'aso_models'

aso_models/apps.py

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+from django.db import models
+from django.utils import timezone
+
+
+class AbstractShrewdModel(models.Model):
+    '''
+    I am quite shrewd about the things I'll let you do with me.
+
+    I won't let you delete me unless you really need to. Because
+    once you delete me, I go into nothingness - You can't get me back.
+    Which is really risky, especially considering the fact that you
+    often visit your recycle bin to restore things you thought
+    you didn't need at some point in time.
+
+    Anyways, the gist is, anytime you call `delete` on me I'll just
+    keep myself out of your way. I'll go into my (soft) deleted state.
+    You'll know where to find me when you realise the errors of
+    your ways and feel sorry :)
+    '''
+    class Meta:
+        abstract = True
+
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+    activated_at = models.DateTimeField(
+        default=timezone.now, blank=True, null=True
+    )
+    deleted_at = models.DateTimeField(blank=True, null=True)
+
+    objects = models.Manager()

aso_models/migrations/__init__.py

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+from django.test import TestCase
+
+from ..models import AbstractShrewdModel
+
+
+class AbstractnessTest(TestCase):
+    '''
+    Assert that all the abstract models in this app are indeed abstract.
+    '''
+    def test_abstract_shrewd_model_is_abstract(self):
+        with self.assertRaises(AttributeError) as e:
+            AbstractShrewdModel.objects.create()
+        expected_error_msg = (
+            'Manager isn\'t available; AbstractShrewdModel is abstract'
+        )
+        self.assertEqual(e.exception.args[0], expected_error_msg)

aso_models/models.py

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+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'paranoia.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()

aso_models/tests/__init__.py

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+"""
+Django settings for paranoia project.
+
+Generated by 'django-admin startproject' using Django 2.2.4.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.2/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/2.2/ref/settings/
+"""
+
+import os
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = '$o13sixefw1&^%-ovxs$&_p5e(kb)2vgnz8yqtm9f6)a*rcg15'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+
+    'aso_models',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'paranoia.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'paranoia.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/2.2/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/2.2/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/2.2/howto/static-files/
+
+STATIC_URL = '/static/'

aso_models/tests/test_models.py

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+"""paranoia URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/2.2/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path
+
+urlpatterns = [
+    path('admin/', admin.site.urls),
+]

manage.py

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+"""
+WSGI config for paranoia project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.2/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'paranoia.settings')
+
+application = get_wsgi_application()